Paradyne 3910 operation manual Modem Ð VF Connection, Dial

COMSPHERE 3900 Series Modems

	Table B-5
	(1 of 2)
	Modem Ð VF Connection
Symptom	Action
The modem does not receive a	Attach a telephone directly to the telephone line to verify that a dial
dial tone.	tone exists.
	Make sure the VF line is connected to the modem's rear jack labeled
	DIAL.
The modem does not go off-hook	Verify that the Auto Answer Ring Count configuration option is set to a
and answer an incoming call.	value other than 0 (disable). Refer to Line Dialer in Chapter 4.
	Verify that the DTE is providing DTR to the modem.
	If the DTE does not provide DTR to the modem, verify that the
	modem's DTR Action configuration option is set for Ignore. Refer to
	DTE Interface in Chapter 4.
	Verify that all cables are attached to the correct connectors on the rear
	of the modem.
The modem goes off-hook,	Perform a Local Analog Loopback test and verify that data entered at
answers, but does not connect.	the DTE is echoed back to the DTE.
	Verify that the originating modem is compatible with your receiving
	modem.
	Verify that the originating modem recognizes your modem's answer
	tone.
	Verify that the originating modem supports your modem's modulation
	schemes. The 391x Series modem recognizes CCITT V.32bis, V.32,
	V.22bis, V.22, V.21, Bell 212A, and Bell 103J. The 391x Series modem
	does not support other vendors' proprietary modulation schemes.
	Force your modem to operate at the same modulation scheme as the
	originating modem to see if they connect.
The Originate Mode does not	Verify that the modem's DTE Dialer Type configuration option is set to
function properly.	the correct setting: either AT, DTR Dialing, V.25bis Async, V.25bis
	Bisync, or V.25bis HDLC. Refer to DTE Dialer in Chapter 4.
The modem does not go off-hook	If using AT Dialing, refer to the Table B-2, ModemÐDTE Connection.
and begin dialing.	If using DTR Dialing, verify the telephone number stored in directory
	location 1, and verify that the DTE is raising DTR from Off to ON to
	initiate a dial.
	If using V.25bis Async, verify that the correct character format is set to
	7 data bits with even parity and 1 stop bit, and the carriage return and
	line feed are used as command terminators.
	If using V.25bis Bisync, verify that the correct character format uses
	two synchronous control characters and a start-of-text control
	character before the text block, and an end-of-text control character
	after the text block.
	If using V.25bis HDLC, verify that the character format uses flag,
	address, and control characters before the text block and a frame
	sequence check and flag after the text block.

B-4 November 1996 3910-A2-GN32-30